What is definition shimmy?

Shimmy refers to an abnormal vibration or shaking, often in the front end of a vehicle, typically felt through the steering wheel. It occurs due to a harmonic resonance between the tires, wheels, and suspension components, particularly when a wheel is out of balance or the tire is not properly inflated. Shimmy can lead to accelerated tire wear, decreased fuel efficiency, and decreased overall stability and safety of the vehicle. It must be diagnosed and repaired promptly to avoid further damage or accidents.